Magnetism

Front

Magnetic Force Noun

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[mag-net-ik fors]

Back

Magnetic Force

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The force of attraction or repulsion generated by moving electric charges or magnetic materials.

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Example: This diagram shows that the magnetic force causes opposite poles (North and South) of two bar magnets to attract, or pull toward, each other.

Front

Magnetic Pole Noun

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[mag-net-ik pohl]

Back

Magnetic Pole

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One of two regions on a magnet, designated north and south, where the magnetic force is strongest.

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Example: A magnet has two poles, North (N) and South (S), where the magnetic field is strongest, as shown by the concentrated lines.

Front

Magnetic Field Noun

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[mag-net-ik feeld]

Back

Magnetic Field

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A region around a magnetic material or a moving electric charge within which the force of magnetism acts.

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Example: This diagram shows the invisible magnetic field around a bar magnet, with lines flowing from the North pole (N) to the South pole (S).

Front

Magnetic Domain Noun

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[mag-net-ik doh-mayn]

Back

Magnetic Domain

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A microscopic region within a magnetic material in which the magnetization is in a uniform direction.

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Example: In an unmagnetized material, magnetic domains point in random directions. An external magnetic field causes these domains to align, making the material magnetic.

Front

Ferromagnetic Material Noun

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[fer-oh-mag-net-ik muh-teer-ee-ul]

Back

Ferromagnetic Material

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A material that can be strongly magnetized and is highly attracted to magnets.

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Example: This image shows iron filings, a ferromagnetic material, aligning along the invisible magnetic field lines of a bar magnet, demonstrating their strong attraction to magnets.

Front

Electromagnetism Noun

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[ih-lek-troh-mag-nuh-tiz-um]

Back

Electromagnetism

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The interaction and relationship between electric currents or fields and magnetic fields.

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Example: This diagram shows how rotating a wire coil (a conductor) within a magnetic field generates an electric current, which lights up the bulb.

Front

Solenoid Noun

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[soh-luh-noid]

Back

Solenoid

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A coil of wire that acts as a magnet when an electric current is passed through it.

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Example: This diagram shows a solenoid, which is a coil of wire. When electric current flows through the wire, it creates a magnetic field inside and around the coil, similar to a bar magnet.

Front

Electromagnet Noun

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[ih-lek-troh-mag-net]

Back

Electromagnet

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A type of magnet in which the magnetic field is produced by an electric current.

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Example: This image shows two permanent bar magnets with similar poles repelling each other. It does not illustrate an electromagnet, which is a magnet created by an electric current.

Front

Electric Motor Noun

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[ih-lek-trik moh-ter]

Back

Electric Motor

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A device that converts electrical energy into mechanical energy.

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Example: This diagram shows how an electric motor works. Electric current from a battery flows through a coil between two magnets, creating a magnetic force that causes the coil to spin.

Front

Electromagnetic Induction Noun

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[ih-lek-troh-mag-net-ik in-duhk-shun]

Back

Electromagnetic Induction

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The process of generating an electric current in a conductor by placing it in a changing magnetic field.

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Example: Moving a magnet near a coil of wire creates, or induces, an electric current in the wire, which is detected by the galvanometer.